Marking for hemacytometers



NOV. 1,1927. I 1,647,865

, c. A. HAUSSER V MARKING FOR HEMACYTOMETERS Filed Aug. 6', 1924 Patented Nov. 1, 1927.

'- UNITED STATES,

PATEN T OFFICE.

CARL ADOLPE HAUSSEB, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO 0. A

PENNSYLVANIA, A FIRM CONSISTING OF CARL ADOIIPH HAUSSER AND ANTHONY ADOLPH HAUSSEB.

HAUSSEB & SON, OF PHILADELPHIA,

MARKING FOR HEMACYTOMETERS.

, Application filed August 6,

This invention relates to haemacytometers and similar devices having marked areas,

constituting counting chambers, scales, or 1 the like, and the principal object of the in- 5 vention is to provide a novel and improved marking, obviating much of the confusion and difficulty encountered in the use of the present forms of such appliances and materially facilitating the counting and other operations.

In the attached drawings:

Figures 1 and 2 each show haemacytometer markings made in accordance with my invention.

With reference to the drawings, it will be noted that the new s stem of marking comrises the usual prim ry divisions 1. created y the intersecting lines 2. These divisions, or rather those of them which occupy the center of the field where the counting operations are carried out, are, in turn, subdivided by a number of lines 3, parallel to the primary dividing lines 2, which collectively serve to effect a rediyision of each of the lar er divisions 1.

I t will be observed that those of the primary divisions 1. which comprise the center of the field, are, in each case, defined by two etched lines, spaced in close proximity,-

and that the trans arent interval therebetween, which may e approximately of the same width as the opa ue lines or even less, constitutes the actual bounding line which is used in the operation of counting. Herein resides the essence of the invention, for

this feature very materially lessens the difficulty and confusion, together with the undue eye-strain, which'is an inevitable accompaniment of the type of haemacytometers 40 now in'use.

It is, of course, apparent that this invention is not to be restricted-to the forms here shown and described, as regards numbers of lines or divisions, but is subject to many modifications involving the use of the improved divisional boundary or marking elements herein described and illustrated. Nor is the invention limited to haemacytometers,.since the marking in principle is applicable to numerous forms of slides used in connection with the microscope.

I claim:

1. A defining line for haemacytometers and like microscope slides consisting'of the 1924. Serial No. 730,531.

transparent line between two closely adjacent parallel opaque lines.

2. A system of marking for haemacytometers and like microscope slides comprising both opaque and transparent division-defining lines.

3. A system of marking for haemacytometers and like microscope slides comprising sets of lines defining divisions and subdi-i visions, one of said sets consisting of opaque lines and another set consisting of transparent lines.

4. A system of marking for haemacytometers and like microscope slides comprising a set of transparent lines defining main divisions anda set of opaque lines defining subdivisions. a

5. A system of marking for haemacytometers and like microscope slidescomprising an orderly arrangement of parallel o aque lines disposed in sets of pairs of closel y adjacent parallel lines to define, by means of the transparent intermediate line, divisions of a surface area of the slide. w

6. A system of marking for haemacytometers and like microscope slides comprising an orderly arrangement of parallel opaque lines disposed in sets of airs of closely ad a cent parallel lines to de e, by means of the transparent intermediate line, divisions of a surface area of the slide; with single opaque lines defining subdivisions.

7. A system of marking for haemacytometers and like microscope slides comprising an orderly arrangement of transparent an opaque lines defining respectively divisions and subdivisions of a slide. v

8. A haemacytometer or like microscope slide having thereon an orderly arranfglg surface area of said ment of transparent and opaque lines de ,mg divisions and subdivlsions of a surface area. Y

' 9. A haemacytometer or like microscope slide comprising a plurality of intersectinglines.

' CARL ADOLPH HAUSSER. 

